Hey all,
I recently ported a half dozen homebrewed applications from 0.96 to
1.0 (awesome!) and now I'm in the process of bumping them over from
MySQL to Posgres so I can get ripping on GeoDjango (double awesome!).
This seemed like a great chance to give manage.py's ingenious
"dumpdata" command a try to see if I can move things over that way.
Unfortunately, I've run into a problem that I'm hoping you can help me
through. Per usual, it's probably something dumb I did that's behind
it.
Basically, here's what's happening. The process works great for all of
my apps except one, which is throwing an error every time I try to
dump it. Here's the app-specific command I've been hitting to try and
get it exported in json. I've substituted a generic app name,
'app_label', for the actual name.
python manage.py dumpdata app_label --traceback --indent 4 > fixtures/
app_label.js
And the traceback I get looks like this, with a sanitized model name
substituted for the real thing.
"""
Traceback (most recent call last):
File "manage.py", line 11, in ?
execute_manager(settings)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/management/__init__.py", line 340,
in execute_manager
utility.execute()
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/management/__init__.py", line 295,
in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/management/base.py", line 192, in
run_from_argv
self.execute(*args, **options.__dict__)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/management/base.py", line 219, in
execute
output = self.handle(*args, **options)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/management/commands/dumpdata.py",
line 48, in handle
return serializers.serialize(format, objects, indent=indent)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/serializers/__init__.py", line 86,
in serialize
s.serialize(queryset, **options)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/serializers/base.py", line 47, in
serialize
self.handle_fk_field(obj, field)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/core/serializers/python.py", line 41,
in handle_fk_field
related = getattr(obj, field.name)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/db/models/fields/related.py", line 248,
in __get__
rel_obj = QuerySet(self.field.rel.to).get(**params)
File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/django/db/models/query.py", line 308, in get
raise self.model.DoesNotExist("%s matching query does not exist."
django.db.models.base.DoesNotExist: Model matching query does not
exist.
""
The models.py is pretty simple. There are three models up top, each of
which is linked to a root model by a ForeignKey field. That root model
looks something like...
"""
class Model(models.Model):
title = models.CharField(max_length=300)
fk_1 = models.ForeignKey(fk_1)
fk_2 = models.ForeignKey(fk_2)
fk_3 = models.ForeignKey(fk_3)
def __unicode__(self):
return u'%s, %s' % (self.fk_1, self.fk_2)
class Meta:
ordering = ['fk_1',]
"""
The funny thing is that if I comment out that root model and run
dumpdata again, everything goes swimmingly. So I'm guessing the
problem is in there somewhere. As I've typed out this entirely too
long email, I've started to think and maybe come up with the weird
thing I did to screw it up. Would it matter if I initally imported
that data outside of Django into the model and maybe stupidly left
some of the FK fields null? Well, I think I'm going to go try that
right now. If it's something else obvious, please let me know.
Thanks listers!
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